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Is it possible to have two modules connected to one M340 NOE Ethernet module, or two NOE each with a TCSEGPA23F14F gateway?

You can have several Modbus TCP IO scanners in the same PLC, each of them supporting several PRMs. This limit depends on the PLC type.
You can plug several PRM on the same I/O scanner module as long as the I/O scanner limit of 2KW in and 2KW out is not exceeded